HTTP and HTTPS are the protocols browsers use to fetch web pages, and the single letter difference is huge. HTTP sends data in plain text, so anyone between the user and the server can read or tamper with it. HTTPS wraps the same traffic in TLS encryption, protecting confidentiality and integrity and verifying the server's identity.
HTTPS is no longer optional. Browsers mark plain HTTP as "Not Secure," search engines favor secure pages, and modern features require it. The performance gap that once justified HTTP has largely vanished thanks to modern TLS and HTTP/2.
